Mathematics serves as a strong reinforcement to most of the courses being offered at the Federal College of Forestry Ibadan, Oyo state, Nigeria. The knowledge gained from mathematics is expected to be applied to the courses offered in the College of Forestry. This study investigated the relationship between the students' score in mathematics and their academic performance. Three research questions guided the study. The sample consisted of students from three departments. Pearson Product Moment Correlation formula and linear regression were used in analysing the questions posed. The results showed that significant relationships exist between students' achievement score in mathematics and students' academic performance.